About 2 months ago, a guy in my town hung himself too. His reasoning (what's perceived to be the truth) was that his dad wouldn't accept his homoloveuality, and his mother had already killed herself when he was 4.
You shouldn't jump to conclusions about why somebody has killed themself. You really don't know whether it was the girl or not (of course, there's a Self Delete note and it clearly states it was the girl)